package com.remark.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.remark.dto.LoginFormDTO;
import com.remark.dto.Result;
import com.remark.dto.UserDTO;
import com.remark.entity.User;
import com.remark.mapper.UserMapper;
import com.remark.service.IUserService;
import com.remark.utils.RegexPatterns;
import com.remark.utils.RegexUtils;
import com.remark.utils.UserHolder;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.remark.utils.RedisConstants.*;
import static com.remark.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号格式是否正确
        if(RegexUtils.isPhoneInvalid(phone))
        {
            //不正确
            return Result.fail("手机号格式错误");
        }
        //正确，生成验证码
        String code= RandomUtil.randomNumbers(6);
        //保存验证码到redis，并设置有效期
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码到客户端(模拟)
        log.debug("发送短信验证码成功，验证码:"+code);

        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm
     * @param session
     * @return
     */
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //校验手机号
        String phone= loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone))
        {
            return Result.fail("手机号格式错误");
        }
        //校验验证码
        String cachecode=stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code= loginForm.getCode();
        if(cachecode==null||!cachecode.equals(code))
        {
            //验证码不一致
            return Result.fail("验证码错误");
        }
        //验证码一致，根据手机号查询用户
        //相当于select * from tb_user where phone=?
        //接收查询到的用户
        User user=query().eq("phone",phone).one();
        //判断用户是否存在
        if(user==null)
        {
            //用户不存在
            user=createUserWithPhone(loginForm.getPhone());
        }
        //保存用户信息到redis
        //随机生成Token作为登录令牌
        String token= UUID.randomUUID().toString(true);
        //将user对象转为Hash对象存储
        UserDTO userDTO=BeanUtil.copyProperties(user,UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //存储
        stringRedisTemplate.opsForHash().putAll("login:token:"+token,userMap);
        //设置token有效期
        String tokenkey=LOGIN_USER_KEY+token;
        stringRedisTemplate.expire(tokenkey,LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);
    }

    /**
     * 根据手机号创建用户
     * @param phone
     * @return
     */
    private User createUserWithPhone(String phone){
        //创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //保存用户
        save(user);//insert into tb_user (id,phone,nick_name...) values (...)
        return user;
    }

    @Override
    public Result sign() {
        //获取当前用户ID
        Long userId= UserHolder.getUser().getId();
        //获取当前日期
        LocalDateTime now= LocalDateTime.now();
        //拼接key
        String keySuffix=now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key=USER_SIGN_KEY+userId+":"+keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth=now.getDayOfMonth();
        //写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字 BITFIELD sign:5:202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if(result==null || result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null || num==0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count=0;
        while(true){
            //6.1.让这个数字与1做与运算，得到数字的最后一个bit位
            if((num&1)==0){//6.2.判断这个bit位是否为0
                //6.3.如果为0，说明未签到结束
                break;
            }else{
                //6.4.如果不为0，说明已签到，计数器+1
                count++;
            }
            //6.5.把数字右移一位，抛弃最后一个bit位,继续下一个bit位
            num >>>= 1;
        }

        return Result.ok(count);
    }
}
